Seems like too many people are trying to access this sheet at the same time:
https://support.google.com/docs/answer/2494822#share_with_ma...
https://support.google.com/docs/answer/2494822#share_with_ma...
Sounds interesting though, think I found a write up about it: https://medium.com/we-are-very-online/how-i-went-from-dickin...